#include<iostream>
using namespace std;
double MAX(double x,double y){
	if(x > y)return x;
	else return y;
}
double Max(double a,double b, double c){
	return MAX(MAX(a,b),c)/(MAX(MAX(a + b,b),c)*MAX(MAX(a,b),b+c));
}
int main(){
	double a , b, c ,m;
	cin >> a >>b >> c;
	double r = Max(a,b,c);
	printf("%.3lf",r); 
	return 0;
} 
